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annotate src/sys/win32/dark_theme.cc @ 198:bc1ae1810855

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dep/animia: switch from using classes to global functions the old idea was ok, but sort of hackish; this method doesn't use classes at all, and this way (especially important!) we can do wayland stuff AND x11 at the same time, which wasn't really possible without stupid workarounds in the other method
author Paper <mrpapersonic@gmail.com>
date Sun, 24 Dec 2023 02:59:42 -0500
parents f0ff06a45c42
children 862d0d8619f6
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1 #include "sys/win32/dark_theme.h"
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3 #include <QApplication>
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4 #include <QOperatingSystemVersion>
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5 #include <QSettings>
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6 #include <QWidget>
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8 #include <iostream>
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9 #include <memory>
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11 #include <dwmapi.h>
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13 struct LibraryDeconstructor {
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14 using pointer = HINSTANCE;
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15 void operator()(pointer t) const { ::FreeLibrary(t); };
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16 };
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18 using Library = std::unique_ptr<HINSTANCE, LibraryDeconstructor>;
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19
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20 class Dwmapi {
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21 public:
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22 Dwmapi() { library.reset( ::LoadLibraryW(L"dwmapi.dll")); }
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24 HRESULT SetWindowAttribute(HWND hWnd, DWORD key, LPCVOID data, DWORD sz_data) {
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25 if (!library.get())
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26 return E_POINTER;
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28 // GCC throws a fit here because C/C++ lacks a "generic" function pointer type.
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29 // Ignore.
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30 auto set_wind_attrib = reinterpret_cast<decltype(::DwmSetWindowAttribute)*>(GetProcAddress(library.get(), "DwmSetWindowAttribute"));
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31 if (!set_wind_attrib)
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32 return E_POINTER;
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33
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34 return set_wind_attrib(hWnd, key, data, sz_data);
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35 }
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37 protected:
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38 Library library = nullptr;
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39 };
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41 Dwmapi dwmapi;
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43 namespace win32 {
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44
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45 bool SetTitleBarToBlack(QWidget* win, bool enabled) {
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46 /* 19 and 20 are *both* DWMWA_USE_IMMERSIVE_DARK_MODE.
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47 *
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48 * It's 20 on newer versions of windows (i.e. win11 and late win10),
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49 * but it's 19 on very old versions of win10 nobody ought to be using anymore.
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50 */
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51 static constexpr DWORD DWMWA_USE_IMMERSIVE_DARK_MODE_OLD = 19;
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52 static constexpr DWORD DWMWA_USE_IMMERSIVE_DARK_MODE = 20;
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54 BOOL b = enabled;
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56 {
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57 HRESULT result = dwmapi.SetWindowAttribute(reinterpret_cast<HWND>(win->winId()), DWMWA_USE_IMMERSIVE_DARK_MODE, &b, sizeof(b));
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58 if (result == S_OK)
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59 return b;
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60 }
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62 {
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63 HRESULT result = dwmapi.SetWindowAttribute(reinterpret_cast<HWND>(win->winId()), DWMWA_USE_IMMERSIVE_DARK_MODE_OLD, &b, sizeof(b));
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64 if (result == S_OK)
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65 return b;
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66 }
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68 return b;
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69 }
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71 void SetTitleBarsToBlack(bool enabled) {
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72 for (QWidget* widget : qApp->topLevelWidgets()) {
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73 SetTitleBarToBlack(widget, enabled);
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74 }
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75 }
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76
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77 bool DarkThemeAvailable() {
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78 const auto& ver = QOperatingSystemVersion::current();
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79 return (ver.majorVersion() > 10) ? true : (ver.majorVersion() == 10 && ver.microVersion() >= 17763);
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80 }
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81
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82 bool IsInDarkTheme() {
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83 QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
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84 QSettings::NativeFormat);
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85 return settings.value("AppsUseLightTheme", 1).toInt() == 0;
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86 }
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88 } // namespace win32